…the spacing effect would seem to have considerable potential for improving classroom learning. However, there is little evidence that this potential has been realized. Neither American classrooms nor American textbooks appear to implement spaced reviews in any systematic way…Nor is there much evidence that the next generation of educators is being better informed. In a recent sampling of practitioner-oriented textbooks suitable for use in teacher education programs, I found either little or no mention of the practical benefits of the spacing effect, and in some cases the spacing effect was confused with other phenomena…One well-known educator, in fact, advised against spaced practice at least in the early stages of learning…